Themes determine the banner image, TAB images, icon, and color scheme (implemented using Cascade Style Sheets) of the Portal site, while Skins dictate the look and feel of each portlet on every page.
主题决定横幅图像、选项卡图像、图标和门户网站的颜色方案(使用级联样式表实现)，而皮肤则指定每个页面上每个portlet的外观和感觉。
Cascade refers to the rules to determine which property gets applied when a property is declared multiple times in the different style sheets.
串接是指当不同样式表中对相同属性有不同定义时，应该要用哪一个样式表中的定义的规则。
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